EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF SKEW GIRDER BRIDGES RAVINDRA SWAROOP. Department of Applied Mechanics. Submitted

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1 EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF SKEW GIRDER BRIDGES RAVINDRA SWAROOP Department of Applied Mechanics Submitted in fulfilment of the requirements of the degree of Doctor of Philosophy to the Indian Institute of Technology, Delhi New Delhi , India April 1981

2 CERTIFICATE This is to certify that th^ thesis entitled 'Experimental and Finite Element Analysis of Skew Girder Bridges' being submitted by Ir. Ravindra Swaroop to the Indian Institute of Technology, Delhi, India, for the award of the degree of Doctor of Philosophy in Applied Mechanics, is a record of bonafide research work carried out by him under our supervision and guidance. The thesis work in opinion has reached the standard fulfilling the requirements for our Doctor of Philosophy degree. The research report and the results presented in this thesis have not been submitted in part or in full to any other University or Institute for the award of any degree or diploma. Dr. C.S. Surana Professor Dept. of Civil Engineering Indian Institute of Technology New Delhi , India Dr. C.U. Rathäl<rishnan Professor Dept. of Applied Mechanics Indian Institute of Technology New Delhi , India

3 ACKNOWLEDGEMENTS The author is very much indebted to Professor C.V.Remakrishnan and Professor C.S. Surana for their personal supervj?ion and guidance for this thesis work. Their valuable suggestions and encouragement. were of immense help in planning and carrying out the project. The author is thankful to Professor R.C. flalhotra, Professor PI.C. Chaturvedi, Professor S.1.A. Kazimi, Professor R. Nstarajan and Professor K.L. Kumar for taking personal interest in this project. The author is also indebted to Professor A.K. Basu, Professor S.K. Gulhati and Professor Subhssh Chander, for their kind permission for carrying out the experimental work in the Structures Laboratory of the Institute. The valuable suggestions of Professor Ahuja, in carrying out the experimental investigations are gratefully acknowledged. During the experimental work, the cooperation and help extended by the staff of the Structures Laboratory and Workshop of Civil Engineering Department is gratefully acknowledged. The author is also thankful to the staff of the Photographic Section of the Institute for doing the photographic work. The author takes this opportunity to thank the Director of the Institute. The help rendered by the staff of the Computer Centre of the Institute is gratefully acknowledged.

4 The author is very grateful to the management of (N/s. National Buildings Construction Corporation Ltd., New Delhi, especially Mr. P.N. Sadhu, Mr. B.P. Dave and Mr. R.K. Gupta, for granting the necessary leave. Thanks are also due to Mr. P.M.P. Nambiar for meticulously typing this thgsis and Mr. B.8. irora for tracing thn drawings. The'author thanks his wife, family members and relatives for their constant encouragemnnt and help for successful completion of this thesis work. RAVINDRA SWAROOP

5 ABSTRACT This thesis describes the theoretical and experimental analysis of skew girder bridges. For the purpose of theoretical analysis a finite element based computer program has been developed. The accuracy of the program has been tested using several standard examples. Automated mesh generation facility has been provided to handle the analysis of three and four girder skew bridges. The program is suitably modified to handle a group of moving patch loads. Such a computer program is useful from the point of view of design. Studies for girder bending moments have been carried out on three and four girder bridges by applying firstly a concentrated load at midspan of an exterior girder, secondly by applying a concentrated load at midspan of an interior girder and thirdly by analysing the bridges for their dead loads. The studies are carried out by varying one parameter at a time and applying one load at a time. The parameters varied are a skew angle, girder spacing to span ratio, ratio of flexural rigidity of transverse medium to flexural rigidity of longitudinal girder. The variations of girder bending moments have been plotted along the span of each girder of each bridge analysed. These studies are useful for understanding the distribution of bending moments among the girders of skew bridges. Skew girder bridges having transversals perpendicular to the girders and support diaphragms parallel to the abutments have three

6 cv) types of slab panels viz., triangular, trapezoidal and rectangular. Parametric studies for slab bending moments have been conducted on three girder bridges. In each study the panel under consideration is first analysed by applying a concentrated load at the centroid of the panel and then by applying the same load as pressure load on the entire panel. This type of loading is chosen because the behaviour of the panels under patch load is expected to lie between that under concentrated load and pressure load. These studies are useful to identify the critical slab panels for different combinations of bridge parameters. In an actuel bridge the deck slab is subjected to patch loads. To study the effgct of the size of patch, load is applied through three different sizes of patch on the centre of a rectangular panel of slab of a 450 -skew girder bridge. The finite element results for patch loads are compared with those obtained using Pigeaud's curves. Discrepancies have been observed between the results of the two methods. Experimental investigations have been carried out on a R.C. skew bridge model. The model has three girders, three transversals and two support diaphragms. The scale ratio of the model is 1/6. For testing the bridge, suitable loading and supporting frames of structural steel sections have been designed and fabricated. The bridge has been tested for six positions of load on the girders and two positions of load on the slab. The experimental results of the

7 various influences measured have been compared with those obtained using the computer program and generally a good agreement has been observed. To study slab strains in a greater detail, experiments have also been conducted on an available Sand Araldite model of a 450 skew girder bridge having three.. girders. Patch load is applied directly on the slab of this bridge. The slab strains are measured directly under the patch load and compared with those obtained using the computer program. For concentrated loads applied on the girders, other influences like girder soffit strains and support reactions have also been measured and compared with those obtained using the computer program for this Sand Araldite model. The agreement between the experimental and theoretical results has been very good.

8 CON EI`1TS Page ACKNOWLEOCElTENTS ABSTRACT LIST OF TABLES (Tables are positioned at the end or each Chapter) LIST OF FIGURES AND PHOTOGRAPHS (Figures and Photographs are positioned at the end of each Chapter) LIST OF PRINCIPAL SYMBOLS (ii) (iv) (xiii) (xvi) (xxvii) CHAPTER 1 INTRODUCTION AND LITERATURE SURVEY INTRODUCTION HISTORICAL REVIEW method of Harmonic Analysis Finite Difference Method Grillage Analysis General Shortcomings Finite Element Method Review of Experimental Work OBJECT AND SCOPE OUTLINE OF THE` THESIS 19

9 Page CHAPTER 2 THEORY OF FINITE ELEP~ENT METHOD INTRODUCTION STRUCTURAL IDEALISATION BASIC THEORY OF THE FINITE ELEMENT METHOD REVIEW OF PLATE BENDING ELEM NTS 27 CHAPTER 3 FINITE ELEMENT COMPUTER PROGRAM FOR SKEW GIRDER BRIDGES 3.1 INTRODUCTION 3.2 ECCENTRICALLY STIFFENED SLAB BEAM 3YSTEf THE MIXOPARAMETRIC QUADRILATERAL PLATE 34 BENDING ELEMENT Shape Functions for Four Noded 37 Isoparametric Quadrilateral Element Cartesian Derivatives of G and H Derivation of [ C ] Matrix Derivation of [ Q Matrix LINEAR ISOPARAHETRIC QUADRILATERAL PLANE 41 STRESS ELEMENT 3.5 ECCENTRIC BEA; i ELEMENT Derivption of Displacement and 46 Force Transformation VatriCeS Derivation of Global Transformation 49 D1atrix Derivation of Global Stiffnes3 50 Matrix of Eccentric Beam Element

10 Page 3.5 COMPUTER PROGRAP-1 FOR LINEAR ELASTIC 51 ANALYSIS OF SKEW GIRDER BRIDGES 3.7 CONVERGENCE STUDIES Square Plate T -Bear R C Skew Girder Bridge ilodel CONCLUSIONS 60 CHAPTER 4 DEVELOPMENT OF COMPUTER PROGRAM FOR %LADLING 94 P6,TCH L04,DS NO GROUP OF MOVING PATCH LOADS 4.1 Ii,1T RODUCT I0N CALCULATION OF EQUIVALENT NODAL LOADS COMPUTER PROGRAM TEST PROBLEMS CONCLUSIONS 103 CHAPTER 5 PARAMETRIC STUDIES FOR GIRDER MOMENTS INTRODUCTION 119 5,2 VARIATION OF GIRDER BENDING MOMENTS 120 WITH CHINGE IN SKEW ANGLE Threo i;irder Bridge Four Girder Bridge 121

11 Page 5.3 VARIATION OF GIRDER BENDING h10f~ents WITH 122 CHANGE IN GIRDER SPACING TO SPAN RATIO Three Girder Bridge Four Girder Bridge VARIATION OF GIRDER Os_NDING P1Oi NTS WITH 124 CHANGE IN RATIO OF TOTAL FLEXURAL RIGI- DITY OF TRANSVERSE 1r1EDIUf1 TO FLEXURAL RIGIDITY OF A GIRDER Three Girder Bridge Four Girder Bridge DISCUSSIONS (ND CONCLUSIONS 127 CHAPTER 6 PARt,NETRIC STUDIES FOR SLAB MOMENTS IN 156 GIRDER BRIDGES 6.1 INTRODUCTION VARIrATION OF SLAB MOMENTS WITH CHANGE IN 157 RATIO OF TOTAL FLEXURAL RIGIDITY OF TRANSVERSE MEDIU+f1 TO FLEXURAL RIGIDITY OF A GIRDER 6.3 VARIATION OF SLAB MOMENTS WITH CHANGE IN 159 SKEW ANGLE 6.4 VARIATION OF SLAB MOMENTS WITH CHANGE IN 159 THE DIMENSIONS OF TYRE CONTACT AREA 5.5 DISCUSSIONS AND CONCLUSIONS 161 CHAPTER 7 EXPERIMENTAL STUDY INTRODUCTION DESCRIPTION OF R.C. BRIDGE MODEL 182

12 Page 7.3 DESIGN AND CONSTRUCTION OF LOADING 184 FRAME 7.4 DES IGJ AND CONSTRUCTION OF SUPPORTING 187 FRAi'E 7.5 i1easuring INSTRUMENTS AND INSTRUMENTATION CONTROL TESTS Modulus of Elasticity of Steel Compressive Strength of Concrete Modulus of Elasticity of Concrete Modulus of Rupture of Concrete TESTS ON THE MODEL Cracking Test Single Point Load Tests Patch Load Tests on the Slab TESTS ON A SAND ARALDITE SKEW BRIDGE MODEL SUMMARY AND CONCLUSIONS 205 CHAPTER 8 COMPARISON OF EXPERIMENTAL AND THEORETICAL 220 RESULTS 8.1 INTRODUCTION R.C. BRIDGE MODEL Deflections of Girders Rotations of Girders Girder Strains at Bottom 229 Reinforcement Level

13 Page Slab Strains due to Patch Load ,5 Support Reactions SAND ARALDITE BRIDGE MODEL Deflections of Girders Support Reactions due to Load on 235 Girders Slab Strains and Girder Soffit 235 Strains due to Load on Girders Slab Strains due to Patch Load 237 on the Slab 8.4 DISCUSSIONS AND CONCLUSIONS R.C. Bridge Model Sand Araldite Bridge Model 240 CHAPTER 9 SUMMARY, CONCLUSIONS AND SUGGESTIONS FOR 285 FUTURE RESEARCH 9.1 SUMMARY AND CONCLUSIONS CONTRIBUTIONS OF THE PRESENT STUDY SUGGESTIONVS FOR FUTURE RESEARCH 291 APPENDIX I _ 1 CALCULATION OF PARTIAL DERIVATIVES OF [ J 293 W.R.T. G AND H APPENDIX II REFERENCES VITA DETAILED CALCI'LATIONS FOR MATRIX PAPERS BASED ON PRESENT INVESTIGATIONS 308

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